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Introduce macros for protocol characters.

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This commit introduces descriptively-named macros for the
identifiers used in wire protocol messages.  These new macros are
placed in a new header file so that they can be easily used by
third-party code.

Author: Dave Cramer
Reviewed-by: Alvaro Herrera, Tatsuo Ishii, Peter Smith, Robert Haas, Tom Lane, Peter Eisentraut, Michael Paquier
Discussion: https://postgr.es/m/CADK3HHKbBmK-PKf1bPNFoMC%2BoBt%2BpD9PH8h5nvmBQskEHm-Ehw%40mail.gmail.com
This commit is contained in:
Nathan Bossart
2023-08-22 19:16:12 -07:00
parent 7114791158
commit f4b54e1ed9
25 changed files with 305 additions and 204 deletions
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18
src/backend/replication/walsender.c
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@ -603,7 +603,7 @@ SendTimeLineHistory(TimeLineHistoryCmd *cmd)
dest->rStartup(dest, CMD_SELECT, tupdesc);
/* Send a DataRow message */
pq_beginmessage(&buf, 'D');
pq_beginmessage(&buf, PqMsg_DataRow);
pq_sendint16(&buf, 2); /* # of columns */
len = strlen(histfname);
pq_sendint32(&buf, len); /* col1 len */
@ -801,7 +801,7 @@ StartReplication(StartReplicationCmd *cmd)
WalSndSetState(WALSNDSTATE_CATCHUP);
/* Send a CopyBothResponse message, and start streaming */
pq_beginmessage(&buf, 'W');
pq_beginmessage(&buf, PqMsg_CopyBothResponse);
pq_sendbyte(&buf, 0);
pq_sendint16(&buf, 0);
pq_endmessage(&buf);
@ -1294,7 +1294,7 @@ StartLogicalReplication(StartReplicationCmd *cmd)
WalSndSetState(WALSNDSTATE_CATCHUP);
/* Send a CopyBothResponse message, and start streaming */
pq_beginmessage(&buf, 'W');
pq_beginmessage(&buf, PqMsg_CopyBothResponse);
pq_sendbyte(&buf, 0);
pq_sendint16(&buf, 0);
pq_endmessage(&buf);
@ -1923,11 +1923,11 @@ ProcessRepliesIfAny(void)
/* Validate message type and set packet size limit */
switch (firstchar)
{
case 'd':
case PqMsg_CopyData:
maxmsglen = PQ_LARGE_MESSAGE_LIMIT;
break;
case 'c':
case 'X':
case PqMsg_CopyDone:
case PqMsg_Terminate:
maxmsglen = PQ_SMALL_MESSAGE_LIMIT;
break;
default:
@ -1955,7 +1955,7 @@ ProcessRepliesIfAny(void)
/*
* 'd' means a standby reply wrapped in a CopyData packet.
*/
case 'd':
case PqMsg_CopyData:
ProcessStandbyMessage();
received = true;
break;
@ -1964,7 +1964,7 @@ ProcessRepliesIfAny(void)
* CopyDone means the standby requested to finish streaming.
* Reply with CopyDone, if we had not sent that already.
*/
case 'c':
case PqMsg_CopyDone:
if (!streamingDoneSending)
{
pq_putmessage_noblock('c', NULL, 0);
@ -1978,7 +1978,7 @@ ProcessRepliesIfAny(void)
/*
* 'X' means that the standby is closing down the socket.
*/
case 'X':
case PqMsg_Terminate:
proc_exit(0);
default: